Process for the manufacture of brewers&#39; pitch.



, BEST AVAILABLE 1 which are consequently prejudicial for this ,7

onirnn s're'rss rsrsis'r cri ics;

LEOPOLD SCHMIED, 0F PRAGUE, AUSTRIAJiUNGARY.

rnoc sss son The irnuumoruns or BBEWERtB PITCH.

C OPY' To all whom it may concern:

Specification of Letters Potent. Application fled June 7, 1907. SerialNo. 377,83.

Patented Aug. 11, 1908.

' 1 means not only is any carbonizetion avoided,

Beitlt'nownthatLLEoroLDSonnIencitizen but in addition the volatileconstituents are of the Einpireof A'ust1'ia-Hr111gary, residin atPrague, Austrie-Hungary, have invented certain new and usefulImprovelnentsin the Process for the Manufacture of Brewers Pitch, ofwhich the following is a specific tion, reference being had therein tothe accoinpanying drawing.

Theprcsent invention has for its object a process for the manufacture ofbrewers pitch by the dry distillation of colopho'ny,

in which, as fares possible, all constituents of the colophony which erevolatile 81) the pitching temperatures are driven ofl' while carefullymaintaining low distillation ternperutures, whereupon the distillationresidue is mixed with puraflin inthe well known manner. i

In order to obtain brewers itchwhich is utilizoble with the novel pitcring methods in which temperatures exceeding 200 C; are

employed, it is known to free resinous products from theconstituentsvolatile at these pitching temperatures by vigoroussuperheating. Owing; to the great, heat some carbonizetion, althoughonly a little, takes place, which imparts a deep color to the residue.This is readily detected in all superheated pitches on the norket and inthe mixtures made therefrom, as when dis solved these products leave acarbonaceous residue. I

Hitherto it has been held that the constituents of resin which inapplying pitch at high temperatures become volatile and purpose, werenot distilled over until at a temperature of 330 0. (temperature of themess) andconsequently that the cerboni notion which sheets the flavor ofthe beer, was unavoidable; it was thought that it was precisely highdecomposition temperatures which were necessary for obtaining it residueof good quality and that the pitch was favor ebly influenced by them, Ithes, however, been found that the constituents exerting an unfavorableinfluence on the utilization as pitching medium distil o'ver lroicololphony even. at low temperatures ii the disti lotion is carried outvery slowly and so 113 to urolong itsdurntion while carefully avoidingsuperheating, that is to say the temperature is not ellowed to exceed300-C. By this driven off far more effectually than heretor fore and theother pro oerties of the product are also favorably in uenced: forinstance the residue in the still presents greater trectability so thatsmaller quantities of perailin need be added than to oolophony orsuperheated pitches. carried into practice by continuing the drydistillation of the colophony at temperatures The novel process is p of230-300 C. until the loss of mutter caused by the distillation amountsto 16 whereupon it is melted with neutral paraffin or o similarhydrocarbon until a, homogeneous. vernishdihe.v mess is formed.

The rodu'ct by the above method shows it conchy aceou s'freoture andwhen dissolved does not leave a carbonaceous residue. cordingly,contrary to what is the ease. with all so erheeted pitches hithertoknown, which eve o bitter taste caused by the our bonizetio'n', it .doesnot import any lever to beer and wort even in'e worm condition andwithout previous swilling of the cssks;

The coat of varnish produced by the epplication of the novel lite/hingmedium is more resistant and dumb ethen the known cost of pitch, so thatlabor, time and meterielere economized; but even for each pitching muchless pitching; medium is required then when superheated pitch is used.The costs are very thin and adhere well to iron and cement, so that themodern iron and cement fermenting vets may be coated with the var nish.

ascertained the notureof my said invention and in what nonner the seineis to bs per" formed, 1 declare that what i cla m is:

Y v Theresiduein the" still 1s then allowed to cool to 1()()-l.20 'Q,

Having now particularly described and i The herein described process ofproducing V v en entirely neutral pitch which consists f n sub ectingcolophony, consisting of the resin of theconiferee which has been freedfrom ecetico'cid and turpentine oil by distillation, to dry distillationat e tern ereture not in excess of from 280 to 300 (1 until all con.-

its

stituents volatile at the pitching tumpeml ture have been driven oil andthe loss caused i by distillation mnount to from 16 10 18 per cent. andmelting the neutral tastelesz; resi due 5 which rmnaius with av neutralparalliniike E hyllromrliofi corresponding to the (lVSlI'PiI consistencyof 11w pitch.

allixed my signature in presence. of two Wit- In testimony whereof Ihave hereunto

